i actually max the volume out on both amps to test the difference, not on any other volume pot position. Doing so, the e9 is simply louder even on low gain than the 11.32 on high gain. I just need a confirmation from anyone else who has an e9 that this is also the case with them, so that my mind it at ease although it is loud enough for me well below the max volume for 11.32. For a layman/noob like me, louder volume= more power so that is why i am a little confused over here as 11.32 should be twice as loud.
For the 100DB or higher sensivity headphone the NFB11.32 can't turn to max volume, this is cause the headphone too loud and can't hear by ears.
If turn to max volume still not very loud, please check the volume control in the computer if have turn to max, include the driver panel, Windows audio panel, media player volume .